Verbseoul.
하다 verb

질식하다 conjugation (jilsikhada, to choke, to suffocate)

To say to choke, to suffocate politely in the present tense, use 질식해요 (cheel-shee-kae-yoh) · jilsikaeyo. Below is the full conjugation of 질식하다 across the three tenses and three everyday speech levels.

Grammar note (하다 verb): 하다 verbs are formed with a Sino-Korean noun + 하다 (e.g. 공부하다 = study + do). 하다 conjugates irregularly: the ㅏ in 하 contracts with the -아/-어 suffix to give 해 (not *하어). Present polite: 해요; past polite: 했어요. The formal ending is 합니다 (not *하습니다). Most noun+하다 compounds follow this pattern uniformly. See all 하다 verbs →

Conjugation table

pron. = pronunciation guide  · RR = Revised Romanization

Highlighted = where the stem changes

TenseCasual (반말)Polite (요)Formal (합니다)
Present
질식해
cheel-shee-kae
jilsikae
질식해요
cheel-shee-kae-yoh
jilsikaeyo
질식합니다
cheel-shee-kahm-nee-dah
jilsikamnida
Past
질식했어
cheel-shee-kae-ssuh
jilsikaesseo
질식했어요
cheel-shee-kae-ssuh-yoh
jilsikaesseoyo
질식했습니다
cheel-shee-kae-sseum-nee-dah
jilsikaesseumnida
Future
질식할 거야
cheel-shee-kahl guh-yah
jilsikal geoya
질식할 거예요
cheel-shee-kahl guh-yae-yoh
jilsikal geoyeyo
질식할 겁니다
cheel-shee-kahl guhm-nee-dah
jilsikal geomnida

Other useful forms

Honorific / Command Polite (-(으)세요)
질식하세요
cheel-shee-kah-sae-yoh
jilsikaseyo
Suggestion / Let's Polite (요)
질식해요
cheel-shee-kae-yoh
jilsikaeyo
Question Polite (요)
질식해요?
cheel-shee-kae-yoh-?
jilsikaeyo?
Connective "and" — (고)
질식하고
cheel-shee-kah-goh
jilsikago
Conditional "if" — (면)
질식하면
cheel-shee-kah-myuhn
jilsikamyeon
Progressive (고 있어요)
질식하고 있어요
cheel-shee-kah-goh ee-ssuh-yoh
jilsikago isseoyo
Want to (고 싶어요)
질식하고 싶어요
cheel-shee-kah-goh shee-puh-yoh
jilsikago sipeoyo
Can / Able to ((으)ㄹ 수 있어요)
질식할 수 있어요
cheel-shee-kahl soo ee-ssuh-yoh
jilsikal su isseoyo
Because / So (아/어서)
질식해서
cheel-shee-kae-suh
jilsikaeseo
Noun form — (기)
질식하기
cheel-shee-kah-gee
jilsikagi
Noun form — (음)
질식함
cheel-shee-kahm
jilsikam